refactors header notifications (renders them via separate controller / template)

test/javascripts/views/header_view_test.js

@@ -0,0 +1,14 @@
+module("Discourse.HeaderView");
+
+test("showNotifications", function() {
+  var controllerSpy = {
+    send: sinon.spy()
+  };
+  var view = Discourse.HeaderView.create({
+    controller: controllerSpy
+  });
+
+  view.showNotifications();
+
+  ok(controllerSpy.send.calledWith("showNotifications", view), "sends showNotifications message to the controller, passing header view as a param");
+});